Brush holder



R. 3v NONTEBTH BRUSH HOLDER Filed July 10, 1955 IN VEN TOR. ave/(506% ATTORNEY Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to improvements in brush holders for electric motors and generators.

An object of my invention is to provide a motor or generator brush holder of simple, durable and cheap construction.

Another object is to provide a brush holder which is provided with a pair of legs having reversely arranged notches therein to enable ready application of the holder to a supporting element by a lateral motion of the holder.

Other and more specific objects of the invention are mentioned and described herein.

The invention is illustrated in the accompanying drawing, wherein Figure l is a sectional View through a generator fragment showing the armature with my invention applied thereto;

Figure 2 illustrates a section taken on line 2-2 of Figure 1;

Figure 3 illustrates a perspective view of one of the holders and a brush attached thereto;

Figure 4 illustrates a section taken on line 44 of Figure 2;

Figure 5 illustrates a section taken on line 5-5 of Figure 2;

Figure 6 is a fragmental side view of one of the brush holders and the stud mount therefor showing the holder in soiid lines and also dotted lines, in two positions, to illustrate the manner of mounting the holder on its supporting stud by a lateral motion; and

Figure? is a longitudinal section taken through the brush holder and brush illustrated in Figure 3.

Similar numerals of reference indicate like parts throughout the several views on the drawing.

Referring now to the details of the drawing the numeral l indicates the field ring of an electric generator and 2 the cover or head therefor at one end thereof, said cover or head being provided with a bearing boss 3 in which the end l of the armature shaft is suitably journaled to support the armature 5, as is well known in the art. The numeral 6 indicates the usual, or any type of, commutator mounted on the armature shaft and around which a plurality of brush holders 1, 8 and 9 are arranged and pivotally mounted, as hereinafter described, upon the three supporting studs to, H and I2 rigidly fixed in the head or cover 2 with the usual insulation bushings l3 encompassing the base of said studs. Adjacent each of the studs Ill, H and I2 an an- 55 chor stud i4 is rigidly mounted in the cover 2 in the usual insulation bushing I5, as is well known in the art.

The three brush holders 1, 8 and 9 are alike in form and construction and a description of number 8 should sufiice for all three. 5

Accordingly, it is disclosed that the brush holder 8 includes a sheet metal one piece U shaped body which comprises the two legs l6 and I! formed integrally with the cross-bar I8, the latter having the integral binder post lug 10 99 formed therewith, the latter projecting angularly from said cross-bar.

The brush 20 is rigidly and detachably secured to the outer face of the cross-bar I8 by .a screw 2!, and each of the brush holders is 15 provided with a brush 28 in like manner. The brush holders 1, 8 and 9 are detachably mounted on their supporting studs it, I! and I2, as heretofore stated, and are arranged around the commutator with the brushes 28 held in yieldable 20 engagement with the commutator 6, as is well known in the art. The brush holder legs [6 and l! are formed with reversely arranged bearing notches 22 and 23 on the side of the leg, said notches being adapted to be engaged by 25 one of the supporting studs I9, H and 12 to mount the holder on one of the latter. A coil spring 2 controls each of the brush holders, and is carried by one of the supporting studs [0, H and I2, one end of said spring-the outer end 30 ES-resiliently engaging the cross-bar l8 of the brush holder body to urge the brush 28 into yieldable contact with the commutator B, the opposite end 26 of said spring engaging in a groove 21 in the anchor stud M for anchoring 35 said spring end 25. The inner leg l6 of each brush holder is formed with a pointed heel 28 which is adapted to engage the anchor stud l4, as a stop element, when the commutator is removed from within the circle of brush holders, 40 thereby limiting the inward swing of said holders. Each of the brush holders is mounted upon its supporting stud in the same manner, to wit: laterally thereof, by successively causing the notches 22 and 23 to engage the carried stud 45 therefor, and this may be readily accomplished from the side of the stud by first fitting notch 22 to a stud H and thereafter fitting notch 23 to said stud by a twisting movement of the holder. The spring 24 then functions to maintain the juxtaposition of the holder on the stud II. A reversal of the above described mounting operation for the brush holder will enable the ready removal of the brush holder, after removal of the coil spring 24, as suggested in Fig. 6, The

g V 2,026,644 1" a usual flexible conductor 28 may be provided and detachably secured to the lug IQ of the holder by a screw 29.

I claim:

In a brush holder of the class described, a stationary supporting stud, a. brush holder provided with a pair of legs, each of said legs being provided with a notch adjacent one end thereof, said notches being formed on the side of the legs and in reverse relation to each other, and said notches being adapted for successive engagement with said supporting stud from the side of the latter, a brush mounted upon said holder, and spring means for maintaining said holder in juxtaposition on said supporting stud and for urging said brush and holder into yielding relation with a commutator.

ROY C. MONTEITH. 

